Anatomical complexities for root canal Flashcards
How many root canals do upper anterior teeth typically have?
One
How many root canals do upper 4s have and where are they?
2 - buccal and palatal
How many root canals do upper 5s have?
One
How many root canals do upper 6s typically have and where are they?
4, MB1, MB2, P, D
How many root canals do upper 7s usually have?
3
How many root canals do lower anterior teeth have typically?
One
How many root canals do lower premolars typically have?
One
How many root canals do lower molars have typically?
3
What overall shape is the pulp generally?
Oval
Irregular anatomy of lower incisors
Up to 41% have a second lingual canal
Irregular anatomy of lower 4s
25% have 2 canals, 0.5% have three canals
Irregular anatomy of upper 4s
6% have three canals
Irregular anatomy of upper second premolars
40% have a single root canal, 58% have 2 canals
Irregular anatomy of upper 6s
91% have MB2 and 72% have a separate apical foramen
What is the prevalence of c shaped canals?
1% of lower 6s, 3% of lower 7s, increases to 30-42% in Korean populations
What is Ahmed et al’s classification of root canal anatomy?
NTNO-C-F where N is number of roots, TN is tooth number (FDI), O is orifice, C is canal and F is foramen
What do we use to assess curvature of the roots?
Schneider angle
How to calculate the Schneider angle?
Draw a line parallel to the long axis of the tooth in the coronal third. Draw a line from the apical foramen to intersect the first line. The angle formed is Schneider angle.
What Schneider angle indicates an I form canal curvature?
Less than 10°
What Schneider angle indicates a J form canal curvature?
10-30°
What Schneider angle indicates a C or S shaped canal curvature?
Over 30°
What are c shaped canals?
Cross sectional shape similar to the letter c in which there is a single c shaped root or where Mesial and distal canals communicate (or remain separate) due to fusion of the mesial and distal roots.
Which teeth are more prone to c shaped canals?
Lower 7s
What is concrescence?
Fusion of roots of at least two teeth by cementum